Presentation #208.01 in the session Sun-to-Earth Campaign-style Study of Large Space Weather Events.
In the final throes of solar cycle 23, complex Active Region 10930 appeared at the solar east limb with virtually no warning on 5 December 2006. Over the next 10 days it erupted multiple times, producing four X-class and three M-class flares and numerous solar energetic particle (SEP) events. One of the flares permanently damaged a GOES X-ray imager. The interval was further punctuated with solar radio bursts that twice shut down the GPS system on the Sun-facing side of Earth. By the time the active region reached central meridian it was classified as a β-γ-δ region. Sequential eruptions on 13 and 14 December produced ground level event (GLE) # 70, and then a ‘perfect storm’ scenario with a fast coronal mass ejection from the first eruption reaching Earth while SEPs from the second eruption arrived. Simultaneously, space-walking astronauts were re-wiring the International Space Station to channel power from a new solar array. I will present lessons learned from the chain of events and discuss challenges to maintaining control of the ISS during the time frame.